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Medium, CVSS 4.3amended

Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets

CVE-2026-55548GHSA-8xjq-pr36-ccgf

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.yamcs:yamcs-core 5.13.2, 5.12.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2026-55548: 0.36% estimated exploitation activity in the next 30 days; percentile 29.88 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The PacketsApi.exportPackets endpoint in Yamcs fails to properly enforce object-level privileges (ReadPacket) when an API request omits specific packet names. As a result, an attacker with a low-privileged account (or any authenticated user with zero privileges) can dump the entire archive of raw telemetry packets for a Yamcs instance. This leads to a massive Information Disclosure of sensitive mission telemetry, completely bypassing the intended Role-Based Access Control (RBAC) model. Vulnerability Details In yamcs-core/src/main/java/org/yamcs/http/api/PacketsApi.java, the exportPackets method processes requests to export raw packets from the tm (telemetry archive) table. The method attempts to verify privileges using ctx.checkObjectPrivileges(ObjectPrivilegeType.ReadPacket, nameSet). However, if the request.getNameList() is empty (i.e., the attacker does not specify any packet names to filter by), nameSet is empty. The checkObjectPrivileges method loops over this empty set…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-8xjq-pr36-ccgf

  2. Revision 1 · created ·

    Published from osv record GHSA-8xjq-pr36-ccgf

Agent brief

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# Patch Next advisory brief: CVE-2026-55548

Advisory: Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets
IDs: CVE-2026-55548, GHSA-8xjq-pr36-ccgf
Record: https://patchnext.com/advisories/cve-2026-55548 (revision 2, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.yamcs:yamcs-core 5.13.2, 5.12.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.yamcs:yamcs-core: affected >= 5.13.0, <= 5.13.1; <= 5.12.7; fixed in 5.12.8, 5.13.2

## Suggested inspection (read-only)
- Maven org.yamcs:yamcs-core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.yamcs:yamcs-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8xjq-pr36-ccgf (OSV record GHSA-8xjq-pr36-ccgf lists affected ranges: Maven org.yamcs:yamcs-core >=5.13.0 =0 <5.12.8 (fixed))
- Verified: https://github.com/advisories/GHSA-8xjq-pr36-ccgf (GitHub-reviewed advisory GHSA-8xjq-pr36-ccgf lists affected ranges: Maven org.yamcs:yamcs-core >=5.13.0 =0 <=5.12.7)

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